eBay purchases Stumble Upon

eBay announced that it had purchased San Francisco based Stumble Upon for $75 million. Stumble Upon is one of the most popular community based search and recommendation site. With this purchase, eBay hopes to combine search and social marketing. eBay will get Stumble Upon's base of 2.3 million users as well. I've been using Stumble Upon since 2004 and really like its system of narrowing down your search field.